/Engine/Source/Editor/UMGEditor/Public/WidgetBlueprintExtension.h
virtual void HandleCleanAndSanitizeClass ( [UWidgetBlueprintGeneratedClass](API\Runtime\UMG\Blueprint\UWidgetBlueprintGeneratedClass) * ClassToClean, [UObject](API\Runtime\CoreUObject\UObject\UObject) * OldCDO )